Combination drafting-instrument



(No Model.)

G. W. DEATS. COMBINATION DRAI'TING INSTRUMENT.

No. 515,075. Patented Feb. 20, 1894.

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' NITE STATES GEORGE W. DEATS, OF FORT WORTH, TEXAS.

COMBINATION DRAFTlNG-INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 515,075, dated February 20, 1894. Application filed May 31, 1393- 'Serial No. $6,152. lNo model.)

To all whom, it may concern.-

Be it known that I, GEORGE WV. DEATS, a citizen of the United States, residing at Fort Worth, in the county of Tarrant and State of Texas, have invented a new and useful Combination Drafting-Instrument, of which the following is a specification.

My invention relates to a combination instrument; the objects in view being to produce an instrument adapted to be carried about the person and serve as a combined pencilholder and drafting tool and when used in the latter capacity to serve the functions of a divider, a square, a compass, and a caliper for either inside or outside gaging.

With these objects in view the invention consists in certain features of construction hereinafter specified and particularly pointed out in the claims.

Referring to the drawingsaeFigure 1 is a perspective view of a combination drafting instrument and pencil-holder constructed in accordance with my invention. Fig. 2 is a transverse sectional view through the joint of the same. Fig. 3 is a longitudinal sectional view through the center of the instrument. Fig. L is a rear elevation, the parts being in the position they occupy when employed as a square. Fig. 5 is a detail of a guard employed when the instrument is used as a compass. Fig. 6 is a detail of one of the guards employed when used as a caliper.

Like numerals of reference indicate like parts in all the figures of the drawings.

In carrying out my invention I construct from sheet-metal a pair of companion clips of similar size and designated as 1 and 2, the terminals of the clips receiving each other, and those of one clip alternating with those of the other. Thus the two clips are when assembled of the same diameter, in that by alternately arranging their terminals they are spread to the same degree. The outer terminal has secured in anysuitable manner thereto a metal block 3, which together with the several terminals, is perforated as at 4, the perforations in the terminals are plain while that of the block is threaded, and located therein is a thumb-screw 5. The threaded portion of the thumb screw operates in the threaded perforation of the block, while the plain portion of said screw passes through the perforation formed in the terminals, and below the lowermost terminal or in rear of the same is provided with a head, whereby it is prevented from being withdrawn, and whereby also the clips may be drawn snugly together and about ordinary lead pencils 6 which they receive, whereby said pencils are clamped in position. The clips themselves are constructed of sheet metal and are sufficient to secure the pencils in position and are simply aided by the thumb-screw, the main object of the thumb-screw being to provide a means of adjustment, so that when moved pivotally the clips may be secured in any relative position desired. In this manner the pencils serviug as the legs of a compass, a divider, or a caliper may be given any disposition desired and employed in the same manner as an ordinary compass, divider, or caliper.

From the block 3 there extends an arm or plate 7, and upon the exterior of this arm there is located an ordinary spring clasp 8. This clasp and arm may be omitted if desired, or simply the clasp may be omitted, as the arm performs a function, as will hereinafter appear,beyond that one in which it performs in connection with the said clasp, that is, supporting the same. That terminal of one of the clips which is immediately in advance of the rearmost terminal has a stop lug 8 formed thereupon, and the rear terminal has its upper outer corner rounded so as to pass the same and permit of the upper edge of the terminal to abut against the stop-lug, when it will be seen the pencil carried by the clip of said rear terminal will be at a direct right angle to the arm 7, and this is the function that said arm performs other than as a mere support for the spring-clasp. It will be understood of course that the pencil thus swung at a right angle to the arm and forming one branch of the square will be slid longitudinally within the clasp previous to being given such disposition, so that its end will pass by the corresponding end of the companion pencil.

In order to protect the points of the pencils when they are used as dividers or compasses I provide the metal guard points 9 which I have shown in detail, and these it will be seen may be readily slipped over the point of any ordinary pencil. These guard points it will be observed are straight, and hence serve as mere continuations of the legs of the compass, which are in fact the pencils and may be carried upon said pencils so as to preserve the points when the device is not in use. Where it is desired to scribe a circle but one guard point is employed.

When the instrument is employed as a caliper for measuring the internal diameter of openings, tubes, &c., or for measuring the thickness of a given object I employ the curved guard or caliper points 10, also shown in detail, they being applied to the ends of the pencils in the same manner as the guard points 9, in fact I employ one guard point 9 and one guard point 10in certain operations. In measuring the thickness of a given object the guard points 10 are so turned upon the pencils as to converge at their points, and when measuring the diameter of an opening or tube the points are turned outward in a manner that will be obvious.

From the foregoing description, in connection with the accompanying drawings, it will be seen that I have produced a very simple, cheap, and convenient instrument that may be carried upon the person and will serve its several functions in an efficient manner requiring but slight change to adapt it to its various uses. A

I do not limit my invention to the precise details herein shown, but hold that I may vary the same as regards such details in any manner and to any degree within the scope of my claims or the knowledge of the skilled mechanic.

Having described my invention, what I claim is 1. In an instrument of the class described, the combination with a pair of pencil-carrying clips having their terminals alternately arranged and perforated, of a set-screw for binding the terminals together, substantially as specified.

2. In an instrument of the class described, the combination with a pair of opposite penoil-carrying clips having their terminals alternately arranged and perforated, the exterior terminal provided with a screw-threaded block, and a thumb-screw passed through .the perforations of the block and terminals,

threaded to engage the threads of the block, and made plain at such points where it passes through the terminals and having a rear headed end, of an arm extending from the block, substantially as specified.

3. In an instrument of the class described, the combination with a pair of opposite pencil-carrying clips having their terminals alternately arranged and perforated the exterior terminal provided with a screw-threaded block, and a thumb-screw passed through the perforations of the block and terminals, threaded to engage the threads of the block, and made plain at such points where it passes through the. terminals, and having a rear headed end, of an arm extending from the block, and a clasp arranged upon the arm, substantially as specified.

4. In an instrument of the class described, the combination of the opposite pencil carrying clips, the set screw on which the terminals of the clips are pivoted, and a. clasp. depending from the said terminals and, adapted to be disposed between the pencils carried by the clips,substantially as specified.

5. In an instrument of the class described, the combination with the pencil -car-rying clips having their terminals alternately arranged and pivotally connected, an arm ex tending downwardly from one of the terminals, and a stop-lug formed upon the rear terminal and adapted to be contacted with by the terminal immediately in advance thereof when swung at a right angle to the arm, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

GEORGE W. DEA'IS.

Witnesses:

R. W. FLoURNoY, R. N. DENHAM. 

